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Demetri Psaltis

Related publications (410)

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3-Dimensional Disk-Based Optical Correlator

Demetri Psaltis

A total of 300 templates were stored as angularly multiplexed transmission holograms at multiple spots on a photopolymer disk. A novel correlator architecture is described and demonstrated that correlates all the templates against an input image within one ...

1994

Cross-Talk For Angle-Multiplexed And Wavelength-Multiplexed Image Plane Holograms

Demetri Psaltis

The cross talk for image plane holograms is calculated and compared with previously derived results for Fourier plane holograms. Image plane storage is found to have significantly smaller cross talk. ...

1994

Characterization Of The Dupont Photopolymer For 3-Dimensional Holographic Storage

Demetri Psaltis

DuPont's HRF-160 photopolymer film is investigated for use in three-dimensional holographic memories. Measurements of sensitivity, hologram persistence, the lateral spread of the photoinitiated reaction, and the variation of diffraction efficiency with mod ...

1994

Integration Of Leds And Gaas Circuits By Mbe Regrowth

Demetri Psaltis

Fully processed VLSI GaAs MESFET circuits, available through the MOSIS service, have recently been shown to be electrically stable after 3-h thermal cycles at 500-degrees-C. It is therefore feasible to epitaxially regrow photonic device heterostructures di ...

1994

On The Finite-Sample Performance Of The Nearest-Neighbor Classifier

Demetri Psaltis

The finite sample performance of a nearest neighbor classifier is analyzed for a two-class pattern recognition problem. An exact integral expression is derived for the m-sample risk R(m) given that a reference m-sample of labeled points is available to the ...

1994

Method For Holographic Storage Using Peristrophic Multiplexing

Demetri Psaltis

A method of multiplexing holograms by rotating the material or, equivalently, the recording beams is described. Peristropic (Greek for rotation) multiplexing can be combined with other multiplexing methods to increase the storage density of holographic sto ...

1994

3-Dimensional Holographic Disks

Demetri Psaltis

We describe optical disks that store data holographically in three dimensions by using either angle multiplexing or wavelength multiplexing. Data are stored and retrieved in parallel blocks or pages, and each page consists of approximately 10(6) bits. The ...

1994

Cross-Talk In Phase-Coded Holographic Memories

Demetri Psaltis

The cross talk between holograms multiplexed with Walsh-Hadamard phase codes is analyzed. Each hologram is stored with a reference beam that consists of N phase-coded plane waves. The signal-to-noise ratio (SNR) is calculated for a recording schedule for w ...

1993

Electrical Fixing Of Photorefractive Holograms In Sr0.75Ba0.25Nb2O6

Demetri Psaltis

Photorefractive holograms stored in Sr0.75Ba0.25Nb2O6 crystals are electrically fixed at room temperature. The fixed holograms can be read out directly or after a positive-voltage pulse is applied that can dramatically enhance the diffraction efficiency. S ...

1993

Optical Neural Networks - An Introduction By The Feature Editors

Demetri Psaltis

This feature of Applied Optics is devoted to papers on the optical implementation of neural-network models of computation. Papers are included on optoelectronic neuron array devices, optical interconnection techniques using holograms and spatial light modu ...

1993